system
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It happened to me few times, and after that I found the catch… the catch is that you should do this… (I’m not really 100% sure that this is an ultimate fix for that problem, but it works for me…)
Write your post, attach your attachment and send it immediatelly. DO NOT PREVIEW your post first and then send !!! Just attach and send it. It will show up in your thread without any doubt.
Hope this helps, it helped me…